the electric motor

• What happens to a conductor carrying a current in a magnetic field?

  It experiences a force
• What is the name of the effect when a conductor experiences a force in a magnetic field?

  Motor effect
• How can we determine the direction of the force on a conductor in a magnetic field?

  Using Fleming's left hand rule
• What is the application of the motor effect in electric motors?

  • Electric motors utilize the motor effect
  • A loop of wire carrying current rotates
  • The direction of current affects the force
• What happens to the current on either side of the loop in an electric motor?

  It runs in opposite directions
• What forces act on the left and right sides of the loop in a magnetic field?

  Force on the left acts upwards, right downwards
• What happens to the loop when it reaches 90 degrees?

  It stops rotating
• What occurs if the loop rotates beyond 90 degrees?

  The forces push the loop back to 90 degrees
• How can the problem of the loop stopping at 90 degrees be solved?

  By switching the direction of the current
• What device is used to switch the direction of the current in an electric motor?

  Split ring commutator
• What is the function of the split ring commutator?

  It switches the direction of the current
• How does the split ring commutator allow the motor to keep rotating?

  By switching current direction at 90 degrees
• What happens to the forces on the left and right sides after the current switches direction?

  Left side acts upwards, right downwards
• What allows the motor to continue rotating after the current switches?

  The momentum of the wire keeps it turning